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The Addresses and Buildings key register (BAG) is an automated system in which Dutch municipalities keep their information about local addresses and buildings up to date. Municipalities store this information in the National Facility for Addresses and Buildings (BAGLV). The Land Registry Office (Kadaster) manages the National Facility and makes the data available to governments, companies, institutions and citizens.
Providing BAG data only once
If a government organisation asks you to provide data that has already been recorded in the BAG, you are not obliged to do so. You have to provide information, such as a change of address, only once to a government organisation. This information should then be available to other government agencies as well.
Using BAG data
You may use the data from the BAG, including all postal codes, without any restrictions. For example, for creating applications (apps) for smartphones or tablets.
Data from the Subsoil Register
Do you use data relating to soil and subsoil? The national government, as well as local governments (such as provinces, municipalities and water authorities), is obliged to centrally register any new data. There is a national subsoil register (BRO) containing data around:
You can easily access information (in Dutch) from the national subsoil register.